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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan and Lease Losses Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charge-off amount $ 2,451 $ 950   $ 3,514 $ 15,589  
Total loans 6,719,570 $ 7,036,004   6,719,570 $ 7,036,004 $ 7,700,873
Line of Credit            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Charge-off amount     $ 13,900      
Total loans     $ 15,000      
Unfunded Loan Commitment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unfunded loan commitments $ 4,300     $ 4,300   $ 4,600